Heney davey



(No Model.)

H. DAVEY;

STEAM MOTOR.

Iva 357,468.

\ NlTE TATES HENRY DAVEY, OF LEEDS, COUNTY OF YORK, ENGLAND.

STEAM=MOTOR.

SP A QN forming part of Letters Patent No. 357,468, dated February 8,1887.

Application filed July 21, 1886. Serial No. 208,656. (No model.) Patented in England April 22, 1886, No. 5,607; in France July 2, 1986, No. 177,156; in Bilgium July 6, 1886, No. 73,750, and in Italy August 25, 1886, XL, 216.

To all whom it may concern.-

Be it known that I, HENRY DAVEY, a citizen of England, residing at Leeds, in the county of York, England, have invented anew and useful Improved Steam-Motor. (for which I have obtained a patent in Great Britain, No. 5,607, dated April 22, 1886; in France, No. 177,156, dated July 2, 1886; in Belgium, No. 73,750, dated July 6, 1886, and in Italy, Vol. XL, No. 216, dated August 25, 1886,) of which the following is a specification.

Heretofore various steam-motors have been specially designed to insure safety against oxplosions and to require comparatively little attention, such motors being particularly designed and useful for general purposes, as in private houses for electric lighting and for working domestic machinery.

My invention has for its object to provide a novel, simple, and compact motor for the purposes mentioned, and to provide novel means for regulating pressure and providing feed for motors of the class referred to, and for other motors.

To such ends the invention consists in the features of construction and combination of devices hereinafter described and claimed, reference being made to theaccompanying drawings, in which- Figure 1 of'the accompanying drawings is a vertical section of a steam-motor according to my present invention; and Fig. 2 is a side elevation of the same, showing in section the air and circulating pump and the pressure and feed regulating apparatus.

Referring to Fig. 1, the boiler Ahas withi it two fuel-spaces, Y Y, separated by two midfeathers, forming water-spaces, and a flue, Z, between them. The fuel-spaces being charged through removable covers at the top and kindled at the bottom,'the combustion goes on for many hours without requiring attention or fresh stoking. Obviously, the number of midfeathers and fluessuch as Z-may be varied. The engine, which is all contained within a casing, B, is single-acting, the steam from the boiler being by means of the partly-rotating valve 0 admitted above the piston T and the exhaust passing by the channel V down to the surface condenser NV. The connecting rod and crank are within the casing 13, the shaftU passing through stuffingboxes in the sides of B. The space under the piston T communicates with the condenser by a hole, X, opening into the channel V, and by a small siphonpipe, D, by which water of condensation is drained off, the oil floating over it being from time to time run off by a cock, (I. A drainpipe, E, leads backs to the boiler, water of condensation, or priming. 7

Referring next to Fig. 2, I make the plunger 0, which is Worked by a crank or eccentric from the engine-shaft U, differential, so that the part below 0 acts as an air-pump, withdrawing air and water from the surface-condenser W by a pipe, w, and discharging into a vessel, F, while the annular space above the plunger 0 acts as a pump, drawing water byasupplypipe, 0, discharging it by a pipe, 1), into the space around the tubes of the surface-condenser, whence the water passes by a pipe, q, to astand pipe or column, G. The vessel F communicates by an upper and a lower hole with the stand-pipe G. By the lower hole water is admitted to F when the supply from the airpump is insufficient. The upper hole allows air to escape through the water in G and through apipe, H, which may be carried to such height as is necessary to suit the pressure desired in the boiler. The safety-valve S,is loaded simply by the pressure of the water column above it. As this column isalways less than that in the vessel F, which is at a'lower level, and as the feed-water is supplied to the boiler from F by the float feed-valve at K, the pressure urging the feed-water into the boiler is always greater than the pressure within the boiler, which is determined by the load on the safetyvalve. The pressure maintained in the column G is determined by theheight of the pipe H, by which the water may be discharged; or, when it is discharged by a pipe, M, the pressure may be determined in the following manner: A float, L, in a vessel containing mercury is formed as a valve to close the mouth of the pipe M, leading from the upper part of the stand-pipe G. Obviously, the higher the level of the mercury the greater is the force with which the valve L closes the pipe M, and therefore the pressure in G may be determined by adjusting the level of the mercury.

In order to make the pressure in the column G vary with that in the boiler, I may connect with the vessel containing the float L another vessel, N, which communicates by a pipe, n, with the steam-space of the boiler. Thus, ac cording as the pressure is greater or less in the boiler, the level of the mercury in N is lowered or raised, and the float-valve L is thus pressed upward with more or less force to close the pipe M and to maintain a greater orlcss pressure in the column G. By these combined devices for regulating pressure the steam-pressure in the boiler, by the pipe n, is brought to act on the mercury in the vessel N, depressing its level and proportionally raising the level of the mercury in the vessel containing the float L, thus pressing the float upward to close the mouth of the pipe M, maintaining, therefore, a pressure of water in the pipe M such as will support a column of proportional height in the pipe II, which acts as a load on the safety-valve S, which ultimately determines the pressure in the boiler. \Vhen this press ure becomes less, the mercury ascends in the vessel N,.and descends in the vessel containing the floatL, so that the latter falls slightly, permitting water to escape from the pipe M, whereby the column in the pipe H lowers and the load on the safety-valve S becomes reduced. On the contrary, when the pressure in the boiler'i'ises, the mercury in the vessel N is depressed and'raised in the vessel containing the float L, the float closes with greater pressure the pipe M, and the column rises in the pipe H, thereby increasing the load on the safety-valve S. The limit of pressure is the maximum height of the column in thepipe H, which is never raised to such extent as would likely blow the mercury out of the vessel in which the float L is located. When the float K descends, owing to low water in the boiler, the valve attached to a stem,.and which closes the lower mouth of the feed-pipe leading from the vessel F, is opened and water is admitted to the vessel containing the float K, thus supplying the boiler. \Vhen the water is sufficiently high in the boiler, and consequently in the vessel containing the float K, the latter rises and the valve closes the feed-pipe and prevents further supply to the boiler. The vessel containing the float K is of course in free communication with the boiler.

Although I have shown the air and circulating pump and the arrangements for determining the boiler pressure and feed as applied to a motor-engine such as is shown in Fig. 1, obviously these devices, which are shown in section at Fig. 2, could be applied to motors 01' other forms.

Having thus described the nature of my invention and the best way I know of carrying it out in practice, I claim-- 1. In combination with a boiler having internal fuelspaccs, Y Y, water-spacesinclosing them, mid-feather water-spaces, and a flue, .71, between said mid-feather water-spaces, flue Z, and a single-acting engine within a casing, B, arranged above and in connection with a surface-condenser, \V, substantially as herein described. I

2. In combination with a safety-valve, S, a stand pipe or column, G, communicating therewith and containing water maintained at press ure which loads the safety-valve, substantially as herein described.

3. In combination with the stand pipe or column G and its escape-pipe M, with its valve and mercury-float L, a mercury-vessel, N, communicating by apipe, n, with the steamspace of the boiler A, substantially as and for the purposes set forth.

4. In combination with a feed vessel, K, containing a float and feed-valve, a vessel, F, supplied with water from the air-pump, and communicating by an upper and a lower aperture with the stand pipe or column G, con taining water, which presses on the safetyvalve S, substantially as and for the purposes herein set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 23d day of June, A. D. 1886.

HENRY DAVEY. Witnesses:

F. H. WIGFALL, CHAS. GILLIARD. 

